For anyone in the market, except Cap'n Walnut, here's an interesting find on eBay.
Vintage 30 Ft Steamboat/ Guildford Belle:eBay Motors (item 230364750574 end time Aug-16-09 12:04:08 PDT)

If the link doesn't work you can search "steamboat guildford belle" and it should take you to the auction.

Very reminiscent of the Brown owned Lorena.

If anybody wins the auction I'd love a ride.

Aaron